The only way genetic differences appear significant if is you exclude all other elements that have an effect on it otherwise the other elements play such a greater role that you can neglect it, not to mention if you really want to make a claim that one ethic group as a whole is smarter you have to again be very selecting in filtering out certain individuals to proof such a thing and not go by on stereotypes, stereotypes if you ever got any class on it are never to be used as universal truths for whole ethnic groups.
However this being mmo-c OT i'm not surprised one of you have literally claimed that non-brown people are smarter although that is what is being suggested here without a doubt.